Waterproof awd airproof cardboard and process of making- the same



O. A. HEPPES.

VWATERPROOF AND AIRPROOF CARDBOAHD AND PROCESS 0F MAKING THE SAME.

APPLICATION FILED Dc.6, 1918.

1,329,549; Patented Nov. 4, 1,919.

, To all whom it may concern:

, OTTO A.. HEPPES, 0F LA GRANGE, ILLINOIS.'

WATERPROOF AND .AIRPROOF CARDBOARD AND PROCESS 0F MAKING THE SAME.

Specication of Letters Patent.

Patented Nov. 4, 1919.

Application med December s, 191s. serial No. 265,506.

Be it known thatI, OTTO A. H Errns, a citizen of the United States,residing at La Grange, in the county of Cook and State of Illinois, haveinvented certain new and useful Im rovements in Waterproof and Airproofardboard and Processes of Mak ing the Same, of which the following is aspecification.

My invention relates to a new and useful process of making water-proofand airproof cardboard and cartons.

One of the objects of my invention is to provide a cheap. and continuousprocess of making water-proof and weather-proof cardboard, which isespecially adaptable for stock in the manufacture of cartons, or thelike, which are used for containing foods, or other perishable staplesand products that must be protected from citamination by air anddampness.

Another object of my invention is lto pro-` vide a new process of makingcartons and the like.

In the manufacture of pcartons heretofore, a board, constituting thebase, is cut or punched into the desired shape, to fashion into cartonforms and after the .carton has been made, it is then necessary toprovide an inner container, such as may be made of vrelatively thin andimpervious paper, after which the outer surface of the carton is coveredwith another laminee of paper, of a different character, and 'whichprovides a surface well adapted to receive the paper, whereupon themanufacturer has printed suitable indicia to identify the. products andthe manufacturer thereof.

`This last printed v'paper coating is pasted over the cardboard face toprovlde a finish after the cardboard `pattern has been cut from thesheet.

In preparing card board sheets of thisv character, it has heretoforebeen customaryV to provide the base or stock by securing two relativelythin sheets of straw board, or like sheet stock, together, by a waterand air proof adhesive, such, for example, `as a thin l surface is notwell adapted to receive the printers ink and therefore a separateinkreceiving sheet mustvbe printed and subsequently pasted on the outersurface of the carton. These operations are necessarily expensivebecause they require hand manipulation and personal supervision.

In carrying myv invention into effect I provide a roll of pervious,relatively heavy board, such for example as strawboard, or the like, asindicated by 10 in the accompanying schematic drawing forming a parthereof. The board 10 is then passed through feed rollers 11 and 12 intoa tank 13 in which is `contained a heated solution of penetrable,relatively thin, asphalt 14, heated as by a furnace 15, to the propertemperature. A roller 16 causes continuous submergence of the sheet 10,after which it is passed through the feed rollers 17 and 18 to therollers 19 and 20. It is then passed into a tank 2l under a roller 22,which tank contains a solution of harder, less penetrableasphalticmaterial, which becomes thoroughly water-proof when cool, andforms a continuous, unbroken, impervious coating on each side of theboard 10. The asphalt 23 is heated by a fire 24 to the proper degree andas the sheet passes out of the tank 21 the excessive amount is scrapedoff by .28 to increase thelength to give it time to cool vor becometacky.- A blower 29, or other means, may be used for the purpose ofcooling the sheet 10 as it passes back over the roller 28 so that -bythe time it reaches the roller 30 it is in a tacky or sticky condition.It is then placed between spaced-apart rollers 31 and 32 to the feedvrollers 33 and 34. As it passes through the feed rollers a sheet ofrelatively thin paper, coming from the rollers 35 and 36, respec tively,is pressed into Contact, on either side of the continuous sheet or strip10, vand ythe asphaltic material, being in a tacky conditionand'naturally of a cementitious character, the rollers 33 and 34 causeperfect adhesion between the Vthin paper strips-y 39 and 40 with theboard 10. The strip 39 may be made of a relatively thin paper, such asparchment, paraffin coated, or the like, and the strip 40 may be of acharacter 'be printed before the pattern is formed into carton shape. A.The other side of the carton blank is covered with a paper of parchmentcharacter, similar to that of which the inner containers of cartonsheretofore described, VAare usually made.

The character of paper best adapted for this purpose may be used andwhich is of such nature as to prevent striking through of the asphalticcoating and yet be of a nature that will be sufficiently adhesive toadhere thereto.

ln the roducts made, in the manner described, a ut 75 to 85 per cent. ofthe stock consists of the straw board, the penetrable solution ofasphaltic character and the relativelyl hard layer of asphalt, on eitherside, all-of which are relatively cheap materials, the high gradeor moreexpensive material consisting of the substantially impervious layer ofpaper on one side for the interior of the carton and the ink-receivingpaper on the oppositeside constitute avery small proportion, in weight,of the Whole structure and therefore it will be observed that indyproduct is substantial, cheap and Well a apted for the purpose intendedIn the makingfof the productthe sheets scribccmy name.l

of papery that overlie the asphalticstock are halt an inch, or more,Wider atpeach edge than the stock itself, thus preventing excessiveasphaltic material from oozing out between the sheets 'and reaching theouter surface on either Side.

After the stock material has passed through the mill and become cooled,it is then ready for use.

-Having described 'my invention, What I claim is 1. The art of makingcarton board which consists in passing a strip of relatively thickpervious board through a hot solution of penetrable asphaltic material;then depositing, on eacli side thereof, a uniform coating of relativelyhard substantially impenetrable and impervious asphaltic material 'andWhile fin a sticky, or tacky condition covering one side of said boardwith a relatively thin parchment-like paper and simultaneously coveringthe other side -With a relatively thin sheet of 'paper vadapted toreceive printers ink; then applying pressure to the composite board tostick the' members together and then cooling the finished product.

2. An article of manufacture, carton board stock, comprising a fibrous,pervious board 'base having incorporatedtherevvith Weather- OTT() A.HEPPES.

vvhereofA I hereunto sub-fl

